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Oracle: Reducing disk I/O with SSD

As RAM storage becomes cheaper than ever, many companies are exploring the issue of fully cached Oracle databases.  As noted in an earlier Oracle tip, solid-state disk is changing the way that Oracle professionals manage and tune their databases.


One of the issues is the relatively high cost of fetching an Oracle data block from disk.  In theory, RAM is 10,000 times faster than disk with speeds in the milliseconds versus nanoseconds; however, when the overhead of lock serialization and latches is added in, a logical I/O might be less than a thousand times faster than a physical disk I/O.


SSD is especially useful for Oracle undo logs, redo logs and the TEMP tablespace, but it can be used with any Oracle data file for high-speed access.  In a real world setting, SSD has been used to set a new record for table load rates, using SQL*Loader to get over 500,000 rows per second into a table!  Yes, that is 30 million rows per minute!


Oracle speeds are very high with SSD, and SSD is cheap too at only $1k/gig USD.  The existing TPC-C benchmark is always under challenge in hopes of setting the new world record by exceeding one million transactions per minute using Oracle9i with SSD.


Companies such as Texas Memory Systems are offering solid-state disk replacement for the Oracle data buffer cache to speed up I/O at the physical level.  Companies such as UNISYS are getting blistering performance from Oracle using 100 gigabyte db_cache_size and db_keep_cache_size .


The following section will provide scripts for real time Oracle disk monitoring and then move on into information on the AWR and ASH tables as they relate to Oracle disk I/O.



This is an excerpt from my latest book "Oracle Tuning: The Definitive Reference". 

You can buy it direct from the publisher for 50%-off and get instant access to the code depot of Oracle tuning scripts:




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